You need to act like the 'add a new customer account' page at godaddy:
[url removed, login to view]
That may not work because of cookie stuff but if you navigate to the login page click on 'add a new customer account.'
What I want to do is prepopulate the required input fields and send the data off to create the account as if someone had filled out the page.
This is a very small project but I have many more.